在開始執行此任務之前，我會強烈建議您閱讀Steven Sanderson的Editing a variable length list, ASP.NET MVC 2-style。
準備好了嗎？
好的，現在我們可以進入實施。
第一件事是爲我們的任務定義我們的視圖模型。你已經有了，只是其上定義相應的驗證規則：
public class Person
{
[Required]
public string FullName { get; set; }
[Required]
public string LastName { get; set; }
[Required]
public string Address{ get; set; }
}
，我想我的這個網頁模式應該是List
贊成票，絕對。
因此，讓我們繼續前進，創造我們PersonsController：
public class PersonsController : Controller
{
public ActionResult Index()
{
var model = new[]
{
new Person()
};
return View(model);
}
[HttpPost]
public ActionResult Index(IEnumerable<Person> persons)
{
if (!ModelState.IsValid)
{
return View(persons);
}
// To do: do whatever you want with the data
// In this example I am simply dumping it to the output
// but normally here you would update your database or whatever
// and redirect to the next step of the wizard
return Content(string.Join(Environment.NewLine, persons.Select(p => string.Format("name: {0} address: {1}", p.FullName, p.Address))));
}
public ActionResult BlankEditorRow()
{
return PartialView("_PersonEditorRow", new Person());
}
}
現在讓我們來定義視圖（~/Views/Persons/Index.cshtml）：
@model IEnumerable<Person>
@using (Html.BeginForm())
{
<div id="editorRows">
@foreach (var item in Model)
{
Html.RenderPartial("_PersonEditorRow", item);
}
</div>
@Html.ActionLink(
"Add another person",
"BlankEditorRow",
null,
new { id = "addItem" }
)
<p>
<button type="submit">Next step</button>
</p>
}
<script type="text/javascript">
$('#addItem').click(function() {
$.ajax({
url: this.href,
cache: false,
success: function (html) { $('#editorRows').append(html); }
});
return false;
});
$(document).delegate('a.deleteRow', 'click', function() {
$(this).parents('div.editorRow:first').remove();
return false;
});
</script>
和相應的局部視圖（~/Views/Persons/_PersonEditorRow.cshtml）：
@model Person
<div class="editorRow">
@using(Html.BeginCollectionItem("persons"))
{
<div>
@Html.LabelFor(x => x.FullName)
@Html.EditorFor(x => x.FullName)
@Html.ValidationMessageFor(x => x.FullName)
</div>
<div>
@Html.LabelFor(x => x.LastName)
@Html.EditorFor(x => x.LastName)
@Html.ValidationMessageFor(x => x.LastName)
</div>
<div>
@Html.LabelFor(x => x.Address)
@Html.EditorFor(x => x.Address)
@Html.ValidationMessageFor(x => x.Address)
</div>
<a href="#" class="deleteRow">delete</a>
}
</div>
備註：Html.BeginCollectionItem這裏使用的助手是從史蒂文桑德森的博客文章，我已經鏈接到以前在我的答案，你已經閱讀和熟悉。下面是完整的源代碼：
public static class HtmlPrefixScopeExtensions
{
private const string idsToReuseKey = "__htmlPrefixScopeExtensions_IdsToReuse_";
public static IDisposable BeginCollectionItem(this HtmlHelper html, string collectionName)
{
var idsToReuse = GetIdsToReuse(html.ViewContext.HttpContext, collectionName);
string itemIndex = idsToReuse.Count > 0 ? idsToReuse.Dequeue() : Guid.NewGuid().ToString();
// autocomplete="off" is needed to work around a very annoying Chrome behaviour whereby it reuses old values after the user clicks "Back", which causes the xyz.index and xyz[...] values to get out of sync.
html.ViewContext.Writer.WriteLine(string.Format("<input type=\"hidden\" name=\"{0}.index\" autocomplete=\"off\" value=\"{1}\" />", collectionName, html.Encode(itemIndex)));
return BeginHtmlFieldPrefixScope(html, string.Format("{0}[{1}]", collectionName, itemIndex));
}
public static IDisposable BeginHtmlFieldPrefixScope(this HtmlHelper html, string htmlFieldPrefix)
{
return new HtmlFieldPrefixScope(html.ViewData.TemplateInfo, htmlFieldPrefix);
}
private static Queue<string> GetIdsToReuse(HttpContextBase httpContext, string collectionName)
{
// We need to use the same sequence of IDs following a server-side validation failure,
// otherwise the framework won't render the validation error messages next to each item.
string key = idsToReuseKey + collectionName;
var queue = (Queue<string>)httpContext.Items[key];
if (queue == null)
{
httpContext.Items[key] = queue = new Queue<string>();
var previouslyUsedIds = httpContext.Request[collectionName + ".index"];
if (!string.IsNullOrEmpty(previouslyUsedIds))
foreach (string previouslyUsedId in previouslyUsedIds.Split(','))
queue.Enqueue(previouslyUsedId);
}
return queue;
}
private class HtmlFieldPrefixScope : IDisposable
{
private readonly TemplateInfo templateInfo;
private readonly string previousHtmlFieldPrefix;
public HtmlFieldPrefixScope(TemplateInfo templateInfo, string htmlFieldPrefix)
{
this.templateInfo = templateInfo;
previousHtmlFieldPrefix = templateInfo.HtmlFieldPrefix;
templateInfo.HtmlFieldPrefix = htmlFieldPrefix;
}
public void Dispose()
{
templateInfo.HtmlFieldPrefix = previousHtmlFieldPrefix;
}
}
}
UPDATE：
我不好，我只注意到你的問題被標記爲asp.net-mvc-2。所以我想我的剃刀視圖不適用於你的案例。不過，其他一切都應該一樣。所有你需要做的是更新的意見，使他們使用的WebForms視圖引擎：
這裏的~/Views/Persons/Index.aspx：
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage<IEnumerable<Person>>" %>
<% using (Html.BeginForm()) { %>
<div id="editorRows">
<% foreach (var item in Model) { %>
<% Html.RenderPartial("_PersonEditorRow", item); %>
<% } %>
</div>
<%= Html.ActionLink(
"Add another person",
"BlankEditorRow",
null,
new { id = "addItem" }
) %>
<p>
<button type="submit">Next step</button>
</p>
<% } %>
<script type="text/javascript">
$('#addItem').click(function() {
$.ajax({
url: this.href,
cache: false,
success: function (html) { $('#editorRows').append(html); }
});
return false;
});
$(document).delegate('a.deleteRow', 'click', function() {
$(this).parents('div.editorRow:first').remove();
return false;
});
</script>
，最後（~/Views/Persons/_PersonEditorRow.ascx）部分：
<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<Person>" %>
<div class="editorRow">
<% using(Html.BeginCollectionItem("persons")) { %>
<div>
<%= Html.LabelFor(x => x.FullName) %>
<%= Html.EditorFor(x => x.FullName) %>
<%= Html.ValidationMessageFor(x => x.FullName) %>
</div>
<div>
<%= Html.LabelFor(x => x.LastName) %>
<%= Html.EditorFor(x => x.LastName) %>
<%= Html.ValidationMessageFor(x => x.LastName) %>
</div>
<div>
<%= Html.LabelFor(x => x.Address) %>
<%= Html.EditorFor(x => x.Address) %>
<%= Html.ValidationMessageFor(x => x.Address) %>
</div>
<a href="#" class="deleteRow">delete</a>
<% } %>
</div>
感謝達林，這工作正常。 我需要一些更多的幫助。我想用新的屬性擴展Person類： 'public int Percent {get;組; }' 我希望在提交時驗證服務器驗證，如果IEnumerable中的每個人中的所有百分數的總和等於100.我可以爲此創建自定義屬性以及如何？我的模型是泛型列表，我無法應用[CustomAttribute]，對吧？ –
Cemsha
另外，我應該在頁面頂部有驗證摘要，而不是在每個輸入之後。我已經提出： '<％：Html.ValidationSummary（false，「請更正以下內容並重新提交頁面：」）％>' 是否有方法爲每個Person設置不同的驗證消息？謝謝。 – Cemsha